Open sans isn't loaded on https connection

At the moment, the default foundation install will not use the Open Sans font on an https connection because it is requesting the font over an insecure channel.

Patched to change the `@import` declaration to be protocol agnostic:

```css
@import url("//fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,700italic,400,300,700");
```